package com.example.spring_async.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

import java.util.concurrent.Executor;
import java.util.concurrent.ThreadPoolExecutor;

/**
 * @Author: banban
 * @Desctription: TODO
 * @Date: Created in 2024/1/20 22:20
 * @Version: 1.0
 */
@Configuration
@EnableAsync
public class AsyncConfiguration {

    //定义一个线程池
    @Bean("mainThreadPool")
    public Executor mainThreadPool() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        //核心线程数：线程池创建的时候初始化的线程数
        executor.setCorePoolSize(10);
        //最大线程数：线程池允许创建的最大线程数，只有在缓冲队列满的时候，才会创建新的线程
        executor.setMaxPoolSize(20);
        //队列容量：当poolSize小于corePoolSize的时候，线程池的缓冲队列
        executor.setQueueCapacity(100);
        //允许线程的空闲时间60秒：当超过了核心线程之外的线程在空闲时间到达之后会被销毁
        executor.setKeepAliveSeconds(60);
        //线程池的前缀，设置好了之后可以方便我们定位处理任务所在的线程池
        executor.setThreadNamePrefix("mail-thread-pool");
        //缓冲队列满了之后的拒绝策略：由调用线程处理(一般是主线程)
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.DiscardPolicy());
        executor.initialize();
        return executor;
    }

}
